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As fun as the thought of a zombie apocalypse or alien invasion may seem, i think our greatest enemy will be man kind or mother nature. Check out...
The volcano ongoing now in Hawaii, May 2018, could trigger the landslide of the Hilina Slump on the on the volcanic island's east coast....
http://www.news.com.au/technology/science/supervolcano-becoming-more-dangerous/news-story/11455813ad987c9a696bc487b47276ac